Quick-Exhaust Diaphragm Pump

ABSTRACT

The invention discloses a quick-exhaust diaphragm pump, belonging to the technical field of diaphragm pumps. The key points of the technical scheme of the quick-exhaust diaphragm pump comprises that a buffer seat is arranged at the lower end of the valve seat; a buffer slot is formed in the buffer seat; when the buffer seat is covered on the valve seat, a buffer space is formed by the lower surface of the valve seat and the buffer slot. The quick-exhaust diaphragm pump can prevent airflow in the pressure relief airbag from fluctuating and improves the stability of supply airflow.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Chinese patent application No. 201811335107.6 filed on Nov. 10, 2018. All contents of the above patent application are hereby incorporated by reference in their entirety.

TECHNICAL FIELD

The present invention belongs to the technical field of diaphragm pumps, and more particularly relates to a quick-exhaust diaphragm pump.

BACKGROUND ART

Diaphragm pumps are commonly used to supply compressed air to pressurized targets such as a sphygmomanometer. A diaphragm pump is a pump which conveys air to a pressurized target by deforming a diaphragm portion made of an elastomeric material.

At present, the Chinese patent with the Notification number of CN1288344C discloses a diaphragm pump. The diaphragm pump comprises at least one diaphragm portion forming a pump chamber, a driving portion arranged at the diaphragm portion, a suction valve and a discharge valve communicating with the pump chamber; the driving portion moves up and down to function as a pump; and the diaphragm pump is characterized by a diaphragm main body integrated by connecting at least one diaphragm portion by utilizing a flat portion, the suction valve arranged on the flat portion of the diaphragm main body and corresponding to each diaphragm portion, and the flat discharge valve disposed substantially in the center of the diaphragm portion.

In the prior art, the volume of a pump chamber of a diaphragm pump similar to the above-mentioned diaphragm pump is changed by the up-and-down movement of a piston to realize the supply of airflow. However, as the movement of the piston is intermittent, if the airflow generated by the movement of the piston is directly supplied to the outside by a discharge port, the supply airflow is easily unstable, and thus there is room for improvement.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention is aimed at providing a quick-exhaust diaphragm pump which has the advantage of capability of improving the stability of the supply airflow.

In order to achieve the above objective, the technical solution provided by the present invention is as follows: the quick-exhaust diaphragm pump comprises an upper cover body, a valve seat and a valve plate, wherein when the upper cover body is covered on the valve seat, a communication cavity is formed; an air outlet and a pressure relief opening are formed in the upper cover body; the communication cavity communicates with the air outlet and the pressure relief opening; the valve plate is arranged between the valve seat and the upper cover body; a pressure relief airbag for opening or closing the pressure relief opening is arranged on the valve plate; an air inlet passage for communicating with the pressure relief airbag and an air release passage for discharging air in the pressure relief airbag are arranged on the valve seat; a buffer seat is arranged at the lower end of the valve seat; a buffer slot is formed in the buffer seat; when the buffer seat is covered on the valve seat, a buffer space is formed by the lower surface of the valve seat and the buffer slot; and a supply passage for communicating with the buffer space and the air inlet passage is arranged on the valve seat.

By adopting the technical solution, during operation, air generated by the movement of a piston firstly enters a buffer space, and then enters into the pressure relief airbag by a supply passage and an air inlet passage, so that the pressure relief airbag gradually bulges and blocks the pressure relief opening to ensure that air entering the communication cavity is discharged only from the air outlet. When the air inflation is stopped, the air in the pressure relief airbag is gradually discharged from the air relief passage, and the pressure relief opening is gradually opened, so that the air discharged from the air outlet is discharged to the outside from the pressure relief opening, that is, the air-discharging process is completed.

In summary, before the air enters the pressure relief airbag, the air is collected into the buffer space, so as to avoid the fluctuation of the air in the pressure relief airbag during the pressurization process, and thus to improve the stability of the air supplied to the outside.

The quick-exhaust diaphragm pump is further configured to further comprise a piston device for conveying air to the supply passage, wherein the piston device comprises a piston seat arranged at the lower end of the buffer seat, a diaphragm portion located between the piston seat and the buffer seat, and a driving component for driving the diaphragm portion to incline; an air inlet is formed in the piston seat; a one-way inlet communicating with the air inlet and piston airbags located at the two sides of the one-way inlet and forming a pump chamber are arranged on the diaphragm portion.

By adopting the above technical solution, during operation, the air enters into the pump chamber via the air inlet and the one-way inlet, and the diaphragm portion is inclined by the driving component, so that the piston airbag at one inclined end is squeezed to force the air into the buffer space, and thus, the air inflation is completed.

The quick-exhaust diaphragm pump is further configured as follows: the driving component comprises a base plate in transmission connection with the piston airbags, a rotating wheel eccentrically connected to the base plate by a connecting rod, and a motor for driving the rotating wheel to rotate.

By adopting the above technical solution, the rotating wheel drives the connecting rod to reciprocate in a perpendicular direction after the motor is started, so that the base plate and the piston airbags are inclined, thereby functioning as a pump.

The quick-exhaust diaphragm pump is further configured as follows: locking holes are formed in the base plate, and locking portions clamped in the locking holes extend from the piston airbags.

By adopting the above technical solution, the locking portions are clamped in the locking holes, so as to realize the transmission connection between the base plate and the piston airbags, and thus to achieve the purpose of quick installation.

The quick-exhaust diaphragm pump is further configured as follows: the bottom of the buffer slot is provided with collecting passages communicating with the pump chamber and a one-way valve plate for preventing the reverse flow of air entering the collecting passages.

By adopting the above technical solution, during the air inflation process, the air in the pump chamber enters the buffer space from the collecting passages, and the air in the buffer space can be effectively prevented from reversely flowing by the one-way valve plate

The quick-exhaust diaphragm pump is further configured as follows: the bottom of the buffer slot is provided with a sunken portion which is sunken inwardly, and a protruding portion embedded in the sunken portion extends from the one-way valve plate.

By adopting the above technical solution, the protruding portion of the one-way valve plate is embedded in the sunken portion of the buffer seat, which can effectively prevent the one-way valve plate from being detached from the buffer slot and improve the stability of the one-way valve plate after installation.

The quick-exhaust diaphragm pump is further configured as follows: positioning blocks extending toward the valve seat are arranged at the edges of the two sides of the buffer seat, and positioning grooves in which the positioning blocks are embedded are formed in the valve seat.

By adopting the above technical solution, under the cooperation of the positioning blocks and the positioning grooves, the buffer seat can be quickly aligned with the valve seat, which is beneficial to the improvement of the installation efficiency.

The quick-exhaust diaphragm pump is further configured as follows: the inner sides of the positioning blocks are provided with guiding surfaces with low ends inclined toward the buffer slot.

By adopting the above technical solution, the design of the guiding surfaces can reduce the areas of the end portions of the positioning blocks, so that the positioning blocks can more easily enter the positioning grooves.

From the above, the quick-exhaust diaphragm pump has the following advantages:

1. Before the air enters the pressure relief airbag, the air is collected into the buffer space, so as to avoid the fluctuation of the air in the pressure relief airbag during the pressurization process, and thus to improve the stability of the air supplied to the outside. 2. By setting the one-way valve plate, the air in the buffer space can be effectively prevented from reversely flowing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional structural view of the embodiment; and

FIG. 2 is an exploded structural view of the embodiment;

DESCRIPTION OF REFERENCE NUMERALS

1. upper cover body; 2. valve seat; 3. valve plate; 4. air outlet; 5. pressure relief opening; 6. communicating cavity; 7. pressure relief airbag; 8. air inlet passage; 9. air relief passage; 10. buffer seat; 11. buffer slot; 12. buffer space; 13. supply passage; 14. piston device; 15. positioning block; 16. positioning groove; 17. guiding surface; 18. piston seat; 19. diaphragm portion; 20. driving component; 21. air inlet; 22. one-way inlet; 23. pump chamber; 24. piston airbag; 25. collecting passage; 26. one-way valve plate; 27. sunken portion; 28. protruding portion; 29. base plate; 30. connecting rod; 31. rotating wheel; 32. motor; 33. base; 34. locking hole; 35. locking portion.

DETAILED DESCRIPTION OF THE INVENTION

The invention is further described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the quick-exhaust diaphragm pump comprises an upper cover body 1, a valve seat 2 and a valve plate 3, wherein when the upper cover body 1 is covered on the valve seat 2, a communication cavity 6 is formed; an air outlet 4 and a pressure relief opening 5 are formed in the upper cover body 1; the communication cavity 6 communicates with the air outlet 4 and the pressure relief opening 5; the valve plate 3 is arranged between the valve seat 2 and the upper cover body 1; a pressure relief airbag 7 for opening or closing the pressure relief opening 5 is arranged on the valve plate 3; an air inlet passage 8 for communicating with the pressure relief airbag 7 and an air release passage 9 for discharging air in the pressure relief airbag 7 are arranged on the valve seat 2; one end of the air release passage 9 communicates with the air inlet passage 8; and the other end thereof communicates with the communication cavity 6.

As shown in FIGS. 1 and 2, a buffer seat 10 is arranged at the lower end of the valve seat 2; a buffer slot 11 is formed in the buffer seat 10; when the buffer seat 10 is covered on the valve seat 2, a buffer space 12 is formed by the lower surface of the valve seat 2 and the buffer slot 11; a supply passage 13 for communicating with the buffer space 12 and the air inlet passage 8 is arranged on the valve seat 2; and a piston device 14 for conveying air to the supply passage 13 is arranged at the lower end of the buffer seat 10. Therefore, during operation, the air generated by the piston device 14 can firstly enter the buffer space 12, so as to slow down the air entering the air inlet passage 8 and avoid the fluctuation of the air in the pressure relief airbag 7 during the pressurization process.

Further, positioning blocks 15 extending toward the valve seat 2 are arranged at the edges of the two sides of the buffer seat 10, and positioning grooves 16 in which the positioning blocks 15 are embedded are formed in the valve seat 2; under the cooperation of the positioning blocks 15 and the positioning grooves 16, the buffer seat 10 can be quickly aligned with the valve seat 10, which is beneficial to the improvement of the installation efficiency. In addition, in order to cause the positioning blocks 15 to more easily enter the positioning grooves 16, the inner sides of the positioning blocks 15 in the embodiment are provided with guiding surfaces 17 with low ends inclined toward the buffer slot 11.

As shown in FIGS. 1 and 2, the piston device 14 comprises a piston seat 18 arranged at the lower end of the buffer seat 10, a diaphragm portion 19 located between the piston seat 18 and the buffer seat 10, and a driving component 20 for driving the diaphragm portion 19 to incline; an air inlet 21 is formed in the piston seat 18; a one-way inlet 22 communicating with the air inlet 21 and piston airbags 24 located at the two sides of the one-way inlet 22 and forming a pump chamber 23 are arranged on the diaphragm portion 19. During operation, the air enters into the pump chamber 23 via the air inlet 21 and the one-way inlet 22, and the diaphragm portion 19 is inclined by the driving component, so that the piston airbag at one inclined end is squeezed to force the air into the buffer space 12, and thus, the air inflation is completed.

Further, as shown in FIGS. 1 and 2, the bottom of the buffer slot 11 is provided with collecting passages 25 communicating with the pump chamber 23 and a one-way valve plate 26 for preventing the reverse flow of air entering the collecting passages 25, and air in the buffer space 12 can be effectively prevented from reversely flowing by the one-way valve plate 26. In addition, the bottom of the buffer slot 11 is provided with a sunken portion 27 which is sunken inwardly, and a protruding portion 28 embedded in the sunken portion 27 extends from the one-way valve plate 26; and by embedding the protruding portion 28 of the one-way valve plate 26 in the sunken portion 27 of the buffer seat 10, the one-way valve plate 26 can be effectively prevented from being detached from the buffer slot 11, and the stability of the one-way valve plate 26 after installation is improved.

As shown in FIGS. 1 and 2, the driving component 20 comprises a base plate 29 in transmission connection with the piston airbags 24, a rotating wheel 31 eccentrically connected to the base plate 29 by a connecting rod 30, and a motor 32 for driving the rotating wheel 31 to rotate. A base 33 is arranged at the lower end of the piston seat 18; the motor 32 is arranged on the base 33; and output shaft of the motor 32 passes through the base 33 to be fixed to the rotating wheel 31. Therefore, after the motor is started, the rotating wheel 31 drives the connecting rod to reciprocate in a perpendicular direction, so that the base plate 29 and the piston airbags are inclined, thereby functioning as a pump.

Specifically, as shown in FIG. 2, locking holes 34 are formed in the base plate 29, and locking portions 35 clamped in the locking holes 34 extend from the piston airbags 24; and the locking portions 35 are clamped in the locking holes 34, so as to realize the transmission connection between the base plate 29 and the piston airbags 24, and thus to achieve the purpose of quick installation.

The working process and beneficial effects of the present invention are as follows: during operation, the piston airbags 24 incline by starting the motor 32, so that the volume of the pump chamber 23 is reduced to force the air into the buffer space 12 via the collecting passage 25; the air into the buffer space 12 enters into the pressure relief airbag 7 by a supply passage 13 and an air inlet passage 8, so that the pressure relief airbag 7 gradually bulges and blocks the pressure relief opening until the air entering the communication cavity 6 is discharged from the air outlet 4, that is, the supply of the air to the outside is completed. When the air inflation is stopped, the air in the pressure relief airbag 7 is gradually discharged from the air relief passage 9, and the pressure relief opening 5 is gradually opened, so that the air discharged from the air outlet 4 is discharged to the outside from the pressure relief opening 5, that is, the air-discharging process is completed.

In summary, before the air enters the pressure relief airbag 7, the air is collected into the buffer space 12, so as to avoid the fluctuation of the air in the pressure relief airbag 7 during the pressurization process, and thus to improve the stability of the air supplied to the outside.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, and the like which are within the scope of design concept of the present invention should be included in the protection scope of the present invention. 

What is claimed is:
 1. A quick-exhaust diaphragm pump, comprising an upper cover body (1), a valve seat (2) and a valve plate (3), wherein when the upper cover body (1) is covered on the valve seat (2), a communication cavity (6) is formed; an air outlet (4) and a pressure relief opening (5) are formed in the upper cover body (1); the communication cavity (6) communicates with the air outlet (4) and the pressure relief opening (5); the valve plate (3) is arranged between the valve seat (2) and the upper cover body (1); a pressure relief airbag (7) for opening or closing the pressure relief opening (5) is arranged on the valve plate (3); an air inlet passage (8) for communicating with the pressure relief airbag (7) and an air release passage (9) for discharging air in the pressure relief airbag (7) are arranged on the valve seat (2); a buffer seat (10) is arranged at a lower end of the valve seat (2); a buffer slot (11) is formed in the buffer seat (10); when the buffer seat (10) is covered on the valve seat (2), a buffer space (12) is formed by the lower surface of the valve seat (2) and the buffer slot (11); and a supply passage (13) for communicating with the buffer space (12) and the air inlet passage (8) is arranged on the valve seat (2).
 2. The quick-exhaust diaphragm pump of claim 1, further comprising a piston device (14) for conveying air to the supply passage (13), the piston device (14) comprises a piston seat (18) arranged at the lower end of the buffer seat (10), a diaphragm portion (19) located between the piston seat (18) and the buffer seat (10), and a driving component (20) for driving the diaphragm portion (19) to incline; an air inlet (21) is formed in the piston seat (18); a one-way inlet (22) communicating with the air inlet (21) and piston airbags (24) located at the two sides of the one-way inlet (22) and forming a pump chamber (23) are arranged on the diaphragm portion (19).
 3. The quick-exhaust diaphragm pump of claim 2, characterized in that the driving component (20) comprises a base plate (29) in transmission connection with the piston airbags (24), a rotating wheel (31) eccentrically connected to the base plate (29) by a connecting rod (30), and a motor (32) for driving the rotating wheel (31) to rotate.
 4. The quick-exhaust diaphragm pump of claim 3, characterized in that locking holes (34) are formed in the base plate (29), and locking portions (35) clamped in the locking holes (34) extend from the piston airbags (24).
 5. The quick-exhaust diaphragm pump of claim 2, characterized in that the bottom of the buffer slot (11) is provided with collecting passages (25) communicating with the pump chamber (23) and a one-way valve plate (26) for preventing the reverse flow of air entering the collecting passages (25).
 6. The quick-exhaust diaphragm pump of claim 5, characterized in that the bottom of the buffer slot (11) is provided with a sunken portion (27) which is sunken inwardly, and a protruding portion (28) embedded in the sunken portion (27) extends from the one-way valve plate (26).
 7. The quick-exhaust diaphragm pump of claim 1, characterized in that positioning blocks (15) extending toward the valve seat (2) are arranged at the edges of the two sides of the buffer seat (10), and positioning grooves (16) in which the positioning blocks (15) are embedded are formed in the valve seat (2).
 8. The quick-exhaust diaphragm pump of claim 7, characterized in that the inner sides of the positioning blocks (15) are provided with guiding surfaces (17) with low ends inclined toward the buffer slot (11). 